Canon Patents EF 400mm f/2.8L IS USM Extender Lens

According to the Egami Blog Canon has filed a patent for an EF 400mm f/2.8L IS USM Extender Lens.

If I'm reading the patent details correctly, this lens would feature user selectable extender settings of 1.4x and 1.7x. This could be a really interesting addition to Canon's super telephoto lens lineup. [Sean]

Patent Details

  • Patent Publication No. 2016-191761
  • Published 2016.11.10
  • Filing date 2015.3.31
  • The main lens
    • Focal length 392.57
    • F-number 2.90
    • Angle of view 3.15
    • Image height 21.64
    • Overall length 371.15
    • BF 44.00

  • Example 1
    • The first state magnification 1.40
    • The second state magnification 1.70

Posted: 11/18/2016 5:21:25 AM ET   Posted By: Sean
Posted to: Canon News    Category: Camera and Lens Patents
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